Concertina wire or Dannert Wire is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina. In conjunction with plain barbed wire and steel pickets, it is used to form military wire obstacles.
During World War I soldiers manufactured concertina wire themselves, using ordinary barbed wire. Today, it is factory made.
Read more about Concertina Wire: Origins, Dannert Wire, Triple Concertina Wire, "Constantine" Wire
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